package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.apache.catalina.realm.UserDatabaseRealm;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        if (StrUtil.isEmpty(phone) || RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误！");
        }

        // 生成验证码
        String code = RandomUtil.randomNumbers(6);
        // 保存验证码到redis并设置有效期2分钟
        stringRedisTemplate.opsForValue()
                        .set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);
        session.setAttribute("code", code);

        // 发送验证码 - 一般是 api
        log.debug("发送验证码: {}", code);
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        String phone = loginForm.getPhone();
        if (StrUtil.isEmpty(phone) || RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误!");
        }

        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        if (cacheCode == null || !cacheCode.equals(loginForm.getCode())) {
            return Result.fail("验证码错误!");
        }

        User user = query().eq("phone", phone).one();
        if (user == null) { // 初次使用 - 完成注册
            user = createUserWithPhone(phone);
        }

        String token = RandomUtil.randomString(20);
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create()
                        .ignoreNullValue()
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString() ));
        // 登录状态有效期30分钟
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY + token, userMap);
        stringRedisTemplate.expire(LOGIN_USER_KEY + token, LOGIN_USER_TTL, TimeUnit.MINUTES);
        return Result.ok(token);
    }

    public User  createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(RandomUtil.randomString(10));
        save(user);  // 注册用户
        return user;
    }
}
